Callback on any token update

[scriptPilot]

It would be great to have a callback whenever there is a token update (at startup and later) in order to save the updated token to the application store :-)

[fullstackduck]

@scriptPilot v1.5.0 provides a listener for user change. If there's more to token update/change please point me to docs. It's only for web, will be adding support for iOS & Android too.

[scriptPilot]

Cool, thanks :-)